Cats sleep more than almost any other animal we live with. If you measured how much of the day your cat spent asleep and compared it to how much of the day you spend asleep, you’d probably feel personally offended. But their numbers are not your numbers, and “a lot” of sleep for a cat is completely different from “a lot” of sleep for you.
The question most owners actually have isn’t “is my cat sleeping too much?” It’s “should I be worried?” Here’s the honest answer, broken down by life stage, along with the specific signs that your cat’s sleep is actually pointing to something you need to look at.
The Normal Numbers
Kittens (0–6 months): 18–20 hours a day
Baby kittens sleep more than almost any mammal. Their nervous system, immune system, and skeletal structure are all developing at a furious pace, and sleep is when that growth actually happens. A kitten that’s awake for 90 minutes is a kitten that will crash hard. This is normal and healthy.
Adult cats (1–7 years): 12–16 hours a day
This is the range you should expect from a healthy adult cat, and it covers a lot of individual variation. Twelve hours is a very active cat; sixteen is a mellow one. Both are fine.
Their sleep is also structured differently from ours — cats don’t do one big block of sleep. They do many short cycles throughout the day, often lightly dozing in “cat nap” mode where they can wake instantly to a sound. True deep sleep (where they’re totally relaxed, maybe twitching dreams) happens for shorter periods, mixed in with the lighter dozing.
Senior cats (7+ years): 16–20 hours a day
Older cats sleep more, both because they tire faster and because their joints hurt a little, their arthritis is beginning (whether you’ve noticed it or not), and their body does more recovery work. A 12-year-old sleeping 18 hours a day is normal.
What is not normal is a senior cat whose sleep has suddenly changed — either way more or way less — within a few weeks. That’s a vet trip.
Why Cats Sleep So Much (The Evolution Argument)
The short answer: hunting is metabolically expensive, and feast-or-famine is the natural rhythm for a small predator.
Wild cats eat about 10 small meals a day, which means 10 small hunts a day. Each hunt is a short, intense sprint — maximum effort for about 20 seconds — followed by eating, grooming, and conservation of energy. Over millions of years, cats evolved a body plan that’s built for brief, explosive bursts and long rest periods. Your indoor cat may not be hunting, but their body still runs on that same schedule. Sleep is the default state; being awake is the exception.
Housecats also often sleep when they’re bored. If there’s nothing to do and no prey to chase, they’ll just sleep. Which brings us to the first thing to think about if your adult cat is suddenly sleeping more than they used to.
Is My Cat Sleeping Too Much? Four Checks
1. Did their routine change?
If you used to be home all day and now you’re gone for 10 hours, your cat is sleeping more because the house is empty and nothing is happening. That’s situational, not medical. The fix is enrichment — toys they can activate alone, a window perch, a bird feeder outside the window, a food puzzle at breakfast. Our Smart Rolling Ball is designed for exactly this scenario — it goes off on its own and keeps cats engaged while you’re not home.
2. Have they lost interest in food, play, or you?
A cat that sleeps a lot but still gets up for meals, still plays if you dangle a toy, and still greets you — that cat is fine. A cat that sleeps a lot and is suddenly not eating, not interested in their favorite toy, or hiding away from the family — that cat is sick and needs a vet.
3. Is their sleep restless or deep?
Healthy cat sleep has clear deep phases — relaxed body, slow breathing, maybe dreaming twitches. If your cat is just lying around in a hunched or tense position, breathing shallowly, not fully relaxing, they’re not resting — they’re uncomfortable or in pain. Pay particular attention to posture: a cat loafed up with their paws tucked under can be comfortable or can be guarding abdominal pain. A cat crouched with their head down and shoulders high is often not well.
4. Is it a sudden shift?
Gradual change over months is normal, especially with age. Sudden change — within days or a couple of weeks — is almost always worth a vet call. The specific conditions that cause increased sleep as an early sign: anemia, kidney disease, hyperthyroidism (though this often causes less sleep), diabetes, infections, and arthritis flares.
Is My Cat Not Sleeping Enough?
Yes, this is a thing. A cat sleeping consistently under 12 hours a day, with constant restless movement, vocalization at night, and pacing is also a warning sign. In middle-aged cats, hyperthyroidism is the main suspect — and the signs often look like “my cat suddenly got younger” (more active, more hungry, drinking more, losing weight despite eating). Blood work catches it easily. In older cats, cognitive dysfunction (feline dementia) can cause disoriented night wandering. Both are treatable; both need a vet.
Where Your Cat Sleeps Matters, Too
Cats sleep where they feel safe. If your cat is sleeping in weird new places — under the bed instead of on it, in the closet, somewhere isolated — pay attention. New hiding is a classic sign of stress or illness.
A cat that’s comfortable in their home will typically pick one or two favorite spots and cycle through them. Give them a dedicated bed in a quiet corner where they can see the room but feel protected — most cats love a plush cocoon-style bed like the Donut Cuddler, which has raised sides so they can lean into something while they sleep.
For senior cats, especially ones with early arthritis, a bed that’s on the ground (no jumping up required), on a thick cushion (easy on the joints), and in a warm spot (sunny window or near a heater) will often become their favorite within days.
Quick Reference
- Kitten: 18–20 hours → normal.
- Healthy adult: 12–16 hours → normal.
- Senior: 16–20 hours → normal.
- Sudden shift in either direction: see your vet.
- Sleep plus one or more of: appetite loss, hiding, bathroom changes, weight change, vocal change: see your vet.
The Bottom Line
Most cats look like they’re sleeping too much because they’re sleeping normally and we’re used to dogs. If your cat is active, eating, drinking, playing, and greeting you — even if they spend 15 hours a day asleep — they’re fine. What you’re watching for is a sudden shift, especially combined with any other change. That’s not a cat sleeping too much. That’s a cat telling you something is off.